Conductivity relaxation and charge transport of trihexyl tetradecyl phosphonium dicyanamide ionic liquid by broadband dielectric spectroscopy

K. Thasneema, M. Shahin Thayyil, S. N. Krishna Kumar, G. Govindaraj, V. C. Saheer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Usually ionic liquids consists of a large organic cation with low symmetry such as imidazolium, pyridinium, quaternary ammonium or phosponium etc combined with enormously wide range of inorganic or organic symmetric anion with melting point below 100. Ionic liquids existing in an extremely large number of possible ion pair combinations. It offers a very wide range of thermo physical properties led to the concept of designer solvents for specific applications. Due to the features of high chemical and thermal stability, low vapor pressure non flammability high ionic conductivity, and they show a good solvent ability towards a great variety of organic or inorganic compounds, ionic liquids have a widespread use in many areas such as batteries, fuel cell, solar cells, super capacitors etc. The main focus of this work is the study of molecular dynamics and conductivity relaxation of amorphous Trihexyl tetradecyl phosphonium dicyanamide ([P14,6,6,6][N(CN)2]) ionic liquid which is proved as a better electrolyte in super capacitors, over a wide frequency 10-2 Hz to 107 Hz and the temperature range between 123k and 265 k by means of Broadband Dielectric Spectroscopy. We observe alpha conductivity relaxation and secondary relaxation above and below Glass Transition Temperature. The experimental results were analyzed using electric modulus representation. The analysis emphasis the inter molecular interaction and the nature of glass forming system, whether it is fragile or strong system. The ionic liquid shows a fragile behavior and the fragility index m=123.59. TGA result of the sample exhibit a good resistance to thermal decomposition, up to 300°C.

Original languageEnglish (US)
Title of host publicationDAE Solid State Physics Symposium 2017
EditorsAmitabh Das, Surendra Singh, Arup Biswas
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735416345
StatePublished - Apr 10 2018
Externally publishedYes
Event62nd DAE Solid State Physics Symposium 2017 - Anushaktinagar, Mumbai, India
Duration: Dec 26 2017Dec 30 2017

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference62nd DAE Solid State Physics Symposium 2017
CityAnushaktinagar, Mumbai

Bibliographical note

Publisher Copyright:
© 2018 Author(s).


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